Improvement in wrench



IMPROVEMENT IN WRNCH.

The Sohedule referred to in these Letters Patent and making part of the same.

To all `whom tt 'may coinccrn;

Be it known that I, PIERRE AUGUsTiN' SAMUEL, of Paris, in the French Empire, civil engineer, have invented anew System of Extensible W1'ench,so-called Ll'Jniversal Key; for tightcning pipes and other cylindrical and other bodies; and I do hereby declare that the following` is a full, clear, and exact description of the same, reference being had to the annexed sheetof drawiugs, making a part of the same.l

lVIy invention consists in a new system of extensiblc key or wreuch, for the cspeoial purpose of tightcning pipes and cyliudrical bodies, but also applicahle to tight- -euiug` bolts and other bcdies of polyg'onal forni.

The exteusible key, which forms the object of the present application for Letters Patent of the United States, has, for characteristic feature, a double cam, lixcdly secured within the key-terminating caps, and actinp` on the ends of swiVel-levers, for the purposc of Operating,r a lockage, which is automatic, and the more cnergetic as the traction on the key-handlu is stronger.

I have just said that the double cam, actuatiug the two euds of the swivel-levers, is an indepcndent piece, fixed steadily anduigidly within the cap which terminates one of the key-ends, but it will be understood that the same double cam may be cast with the keyhandle, and the construction of the tool be siinplilied thereby.

This new system of extensible key, by its working self-actingly, energeticall y, and without any slipping ofv the cylindrical surface, perlnits and popularizes, as it were, the use, restricted heretofore, of screw-nuts of cylindrical form, with or without strioe or corrugations on their external.periphery, which, till now, could not be of any practical use, as there existed not any tool for the'tightening and looseuing,r thereof.

Another advantage of my new extensible key is, that .as it is aoting ratchet-like, or on very small portions of surfaces, it can work within very limited spaces, in

coruers, for instance, and wherever the course of the tool is limited.

I have, in the laccoinpanyin drawiugs, represcnted two arrangements of my new system of extensible key lrepresent-ed in thel accompanying drawings.

intended for tightening and loosening pipes, nut-screws,

' and other cylindric-al or other bodies.

Figure 1 is a front external view of a firstarrangcnient of the said key or wrench.

Figure 2 isaceutral longitudinal section of the same, showing an edge view`of the tool. t

Figure 3 shows, in detail, one of the flanges, to which are. jointed the extensiblc swivel-jaws.

Figurc 4 shows, on a larger scalc, and'inlsectiou, the key-head, and the way in which the swivel-jaws are acted upon by the cains.

Figurc 5 is a front vicw of another arrangenient of the same key, in which the doublel cam, instead of being an indopendent piece, is cast with the handle of the tool.

In all these tigures the same letters of reference indicate the same parts where they rccur.

kuob, and at.v the other by a cap, b.

o, double cam, secured rigid and motionless to theI cap by two rivets (Z.

This double calu has on each side a. bracket, on which are turning the two fianges shown in detail, 3.

11, swivel-jaws or clalnps jointed at 71y to the fianges f. These clainns, whicharc, toothed internally and invcrsely to tightening are extensible, and actuated by the double cam c.

I must observe, in this place, that the double cam is tcrniinated ou each side, at its lower part, by a'notch, to adinit the euds of the swivel-levers at their fart-hcst position, for the purpose of libe `ating the key readily froui the cylinder aeted upon.

Gla'im.

The new cxteusible key or wrenoh, fo1` tightening and loosenin` pipes',';screw-nuts, and other bodies of circular `and other Sections, which is chieflycharaoterized by its extensible swivel-clamps or jaws, acted upon by a douhle-bent cam or eccentric, as dcscribed, and

Witnesses: SAMUEL.

DnMos,

A. GUION. 

